Chi Psi

Chi Psi was founded at Union College in Schenectady, New York, in 1841, the eighth Greek letter social fraternity in the United States. Its flag is divided per saltire, purple and yellow, representing an hourglass, with the Greek letters of the name in yellow on the purple areas of the field.

Source: Baird's Manual of American College Fraternities, 20th ed. (1991)